<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>背景</title>
    <style>
        .box{
            width: 400px;
            height: 400px;
            border: 1px solid red;
            /* background: url(https://xinglong.tech/favicon.ico) no-repeat 50% 50% / 100% 100%; */
            background-image: url(https://xinglong.tech/favicon.ico);
            background-repeat: no-repeat;
            background-position: 100% 100%;
            background-size: 100px 100px;
        }
    </style>
</head>
<body>
    <div class="box">
        Test
    </div>
</body>
</html>